The act of simultaneously extending both fists with a middle finger salute. Most often seen in high-stakes sporting events and highly congested concert venues. For specific meaning, square definitions of “the finger,” “the bird,” “flipping the bird,” “flipping off,” “the finger wave,” and the “read-between-the-lines.”

Etymology: originating from words “double” and “bird”

M. Adams: Did anyone see the Ohio State-Michigan game yesterday? One of the players flipped the derble to somewhere in the neighborhood of 100,000 fans on national television.